TD231-2001P

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TD231-2001P belongs to a kind of protective equipment with current differential relay protection, which is widely used in three-phase asynchronous motor’s starting and stopping. It is mainly used for overload, short circuit protection and motor running state control. In the application of TD231-2001P, overload protection and short circuit protection are the foundation, which needs to complete the function of motor starting and stopping. Therefore, these two functions must be met firstly in order to complete the protection application of the motor.

TD231-2001P working principle is based on the principle of current differential. The relay consists of main circuit and compensation circuit, and the two are connected in series and in parallel. There are current transformer and voltage transformer in the main circuit, which can achieve two different output information: voltage information and current information. In the compensation circuit, there are current transformer and resistor which can change the sensitivity of current difference. When the motor is running, the current transformer at its output will output the difference signal of current difference to the relay’s differential circuit, and then analyze the output current difference. If it exceeds the setting range, the relay will give an alarm signal or trip the motor.

In addition, other auxiliary functions are also needed to complete the application of TD231-2001P. For example, motor overload protection can also be realized by phase sequence control and complete motor starting protection. The phase sequence control method creates the start condition of the motor, and its principle is the same as that of indicator lamp. The three-phase power supply must ensure that the three output voltages have the same phase sequence as the three-phase winding of the motor.

TD231-2001P can also be used with liquid level control equipment. When the liquid level reaches the pre-set level, the float switch can break the circuit and cancel the starting signal, so that the motor can be stopped. At the same time, it can also be used for over-temperature protection. When the temperature of the motor windings in running state is higher than the set value, the motor will be tripped.

In summary, TD231-2001P is an important kind of protective equipment with current-differential relay protection. It is widely used with different industrial equipments and can realize overload, short circuit and motor running state protection, as well as motor starting and stopping conditions. All its functions protect the motor from damage, and should be noted in application.

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